Segfault when running over an ssh connection

[6502]

Not sure if you're interested into fixing this, but in my opinion a more graceful error should be appropriate instead of segfaulting. Running a program that uses xdotool to find the title of active window in a terminal connected over ssh to another host often just crashes badly...

~$ xdotool getactivewindow
Warning: XTEST extension unavailable on '(null)'. Some functionality may be disabled; See 'man xdotool' for more info.
Segmentation fault (core dumped)

Unfortunately it doesn't happen every single time... sometimes the result I get is

~$ xdotool getactivewindow
Error: Can't open display: (null)
Failed creating new xdo instance